OverGrow - I haven't really had time to check exactly how you area getting this hack to work but I guess you are doing something with the '404' method I posted two posts up. I did some checking on sitepoint and found some threads by you on how you use this method for most of your site.

Do you think it would be possible to develop your hack further so that these 'perfect' URLs are not only used by search engines but users as well? ie this sort of link is used throughout your vB as standard, and not just an extra trick for getting search engine listed.

It would be really cool if you could use the "<!-- breadcrumb, nav links -->" as the URL eg this post would have a URL like:

vBulletin_Community_Forum/Customising_vBulletin/vBulletin_Code_Hacks/Releases_Version 2.x/vbSpiderFriend_ -_ Search Engine Friendliness/

These would then also be available as for use as dynamic meta keywords.

Cheers